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REFRIGERTION CONTD.
Q) Give refrigerant properties. ANS.)1.Non toxic, non flammable, non explosive, non corrosive 2.economical, easy leak detection, easily available, environment friendly 3.low sp. heat, low boiling pt., low sp. vol. 4. […]
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BOILER WATER TEST
P-ALKALINITY:- THIS TEST IS CARRIED TO FIND OUT THE PRESENCE OF ALKALINE IN BOILER WATER. BOILER WATER SHOULD BE ALKALINE TO SAVE IT FROM CORROSION.ALKALINITY IS DUE TO HYDROXIDE AND […]
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BOILER CORROSION
ELECTROCHEMICAL CORROSION:- WHEN IRON COMES IN CONTACT WITH WATER, HYDROGEN IONS TAKES ELECTRONS FROM METAL AND BECOMES HYDROGEN WHILE OH(-) REACT WITH METAL TO FORM HYDROXIDE OF METAL. THIS LEAD […]
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BOILER SAFETY VALVE
SAFETY VALVE:- BOILER ARE TO BE FITTED WITH NOT LESS THAN 2 SAFETY VALVES EACH HAVING A MINIMUM INTERNAL DIAMETER OF 25MM. BUT THOSE HAVING HEATING SURFACE < 50 SQM. […]
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REFRIGERATION
REFRIGERATION SYSTEM UNLOADING MECHANISM OF REFRIGERATION COMPRESSOR When the compressor is not running then the control piston is not exposed to the lub oil pressure and the spring press the […]
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SUPERCHARGING
IT IS A METHOD OF OBTAINING MORE POWER WITHOUT INCREASING THE WEIGHT OF THE ENGINE. AIR IS ADMITTED AT HIGHER PRESSURE BUT THE POWER OF THE ENGINE INCREASES DUE TO […]
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BEARINGS AND CRANKSHAFT
Q. ) How will you analyse whether journal bearing (fitted on place) is in good condition or not ? How to make out only by looking that clearance between bearing and […]
